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<meta name="description" content="######1). 换肤思路在源应用APP中，下载皮肤包，使得对应的文件资源得以应用。使用DexClassLoader加载资源包，使用反射来获取资源ID. ######2). 创建SkinChange工程app是应用Module，spinone和spintwo是皮肤插件工程">
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<meta property="og:description" content="######1). 换肤思路在源应用APP中，下载皮肤包，使得对应的文件资源得以应用。使用DexClassLoader加载资源包，使用反射来获取资源ID. ######2). 创建SkinChange工程app是应用Module，spinone和spintwo是皮肤插件工程">
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<meta name="twitter:description" content="######1). 换肤思路在源应用APP中，下载皮肤包，使得对应的文件资源得以应用。使用DexClassLoader加载资源包，使用反射来获取资源ID. ######2). 创建SkinChange工程app是应用Module，spinone和spintwo是皮肤插件工程">
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          <h1 class="post-title" itemprop="name headline">Android-换肤</h1>
        

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        <p>######1). 换肤思路<br>在源应用APP中，下载皮肤包，使得对应的文件资源得以应用。使用DexClassLoader加载资源包，使用反射来获取资源ID.</p>
<p>######2). 创建SkinChange工程<br><img src="https://upload-images.jianshu.io/upload_images/3110861-fea5522823316ea2.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="图1.png"><br>app是应用Module，spinone和spintwo是皮肤插件工程</p>
<a id="more"></a>
<p>######3). app Module</p>
<ul>
<li><p>BaseActivity</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br></pre></td><td class="code"><pre><span class="line">/**</span><br><span class="line"> * Activity基类</span><br><span class="line"> * Created by mazaiting on 2018/6/27.</span><br><span class="line"> */</span><br><span class="line"></span><br><span class="line">public abstract class BaseActivity extends AppCompatActivity &#123;</span><br><span class="line">  /**资源管理器*/</span><br><span class="line">  protected AssetManager mAssetManager;</span><br><span class="line">  /**资源*/</span><br><span class="line">  protected Resources mResources;</span><br><span class="line">  /**主题*/</span><br><span class="line">  protected Theme mTheme;</span><br><span class="line">  </span><br><span class="line">  /**</span><br><span class="line">   * 加载资源</span><br><span class="line">   * @param dexPath dex路径</span><br><span class="line">   */</span><br><span class="line">  protected void loadResources(String dexPath) &#123;</span><br><span class="line">    try &#123;</span><br><span class="line">      AssetManager assetManager = AssetManager.class.newInstance();</span><br><span class="line">      Method addAssetPath = assetManager.getClass().getMethod(&quot;addAssetPath&quot;,String.class);</span><br><span class="line">      addAssetPath.invoke(assetManager, dexPath);</span><br><span class="line">      mAssetManager = assetManager;</span><br><span class="line">    &#125; catch (Exception e) &#123;</span><br><span class="line">      e.printStackTrace();</span><br><span class="line">    &#125;</span><br><span class="line">    Resources superRes = super.getResources();</span><br><span class="line">    superRes.getDisplayMetrics();</span><br><span class="line">    superRes.getConfiguration();</span><br><span class="line">    mResources = new Resources(mAssetManager, superRes.getDisplayMetrics(), superRes.getConfiguration());</span><br><span class="line">    mTheme = mResources.newTheme();</span><br><span class="line">    mTheme.setTo(super.getTheme());</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  @Override</span><br><span class="line">  public AssetManager getAssets() &#123;</span><br><span class="line">    return mAssetManager == null ? super.getAssets() : mAssetManager;</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  @Override</span><br><span class="line">  public Resources getResources() &#123;</span><br><span class="line">    return mResources == null ? super.getResources() : mResources;</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  @Override</span><br><span class="line">  public Theme getTheme() &#123;</span><br><span class="line">    return mTheme == null ? super.getTheme() : mTheme;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p>MainActivity</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br></pre></td><td class="code"><pre><span class="line">public class MainActivity extends BaseActivity &#123;</span><br><span class="line">  private static final String TAG = &quot;MainActivity&quot;;</span><br><span class="line">  private TextView mTextView;</span><br><span class="line">  private ImageView mImageView;</span><br><span class="line">  private ClassLoader mClassLoader;</span><br><span class="line">  </span><br><span class="line">  @Override</span><br><span class="line">  protected void onCreate(Bundle savedInstanceState) &#123;</span><br><span class="line">    super.onCreate(savedInstanceState);</span><br><span class="line">    setContentView(R.layout.activity_main);</span><br><span class="line">    mTextView = findViewById(R.id.tv_show);</span><br><span class="line">    mImageView = findViewById(R.id.iv_show);</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  /**</span><br><span class="line">   * 切换主题1</span><br><span class="line">   */</span><br><span class="line">  public void changeThemeOne(View view) &#123;</span><br><span class="line">    // 获取缓存路径</span><br><span class="line">    String fileDir = getCacheDir().getAbsolutePath();</span><br><span class="line">    // 获取文件路径</span><br><span class="line">    String filePath = fileDir + File.separator + &quot;spinone-release.apk&quot;;</span><br><span class="line">    mClassLoader = new DexClassLoader(filePath, fileDir, null, getClassLoader());</span><br><span class="line">    loadResources(filePath);</span><br><span class="line">    setContentOne();</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  /**</span><br><span class="line">   * 切换主题2</span><br><span class="line">   */</span><br><span class="line">  public void changeThemeTwo(View view) &#123;</span><br><span class="line">    // 获取缓存路径</span><br><span class="line">    String fileDir = getCacheDir().getAbsolutePath();</span><br><span class="line">    // 获取文件路径</span><br><span class="line">    String filePath = fileDir + File.separator + &quot;spintwo-release.apk&quot;;</span><br><span class="line">    mClassLoader = new DexClassLoader(filePath, fileDir, null, getClassLoader());</span><br><span class="line">    loadResources(filePath);</span><br><span class="line">    setContent();</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  /**</span><br><span class="line">   * 设置主题内容</span><br><span class="line">   */</span><br><span class="line">  private void setContent() &#123;</span><br><span class="line">    try &#123;</span><br><span class="line">      Class clazz = mClassLoader.loadClass(&quot;com.mazaiting.UiUtil&quot;);</span><br><span class="line">      // 设置TextView内容</span><br><span class="line">      Method method = clazz.getMethod(&quot;getTextString&quot;, Context.class);</span><br><span class="line">      String string = (String) method.invoke(null, this);</span><br><span class="line">      mTextView.setText(string);</span><br><span class="line">      // 设置ImageView背景</span><br><span class="line">      method = clazz.getMethod(&quot;getImageDrawable&quot;,Context.class);</span><br><span class="line">      Drawable drawable = (Drawable) method.invoke(null,this);</span><br><span class="line">      mImageView.setBackground(drawable);</span><br><span class="line">    &#125; catch (Exception e) &#123;</span><br><span class="line">      e.printStackTrace();</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  /**</span><br><span class="line">   * 设置主题1</span><br><span class="line">   */</span><br><span class="line">  private void setContentOne() &#123;</span><br><span class="line">    int stringId = getTextStringId();</span><br><span class="line">    int drawableId = getImgDrawableId();</span><br><span class="line">    Log.d(TAG, &quot;stringId: &quot; + stringId + &quot;,  drawableId: &quot; + drawableId);</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  /**</span><br><span class="line">   * 获取图片ID</span><br><span class="line">   * @return</span><br><span class="line">   */</span><br><span class="line">  private int getImgDrawableId() &#123;</span><br><span class="line">    try &#123;</span><br><span class="line">      // &quot;com.mazaiting.spinone.R$color&quot; -- spinone module 下的R.color.img</span><br><span class="line">      Class clazz = mClassLoader.loadClass(&quot;com.mazaiting.spinone.R$color&quot;);</span><br><span class="line">      Field field = clazz.getField(&quot;img&quot;);</span><br><span class="line">      int resId = (int) field.get(null);</span><br><span class="line">      return resId;</span><br><span class="line">    &#125; catch (Exception e) &#123;</span><br><span class="line">      e.printStackTrace();</span><br><span class="line">    &#125;</span><br><span class="line">    return 0;</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  /**</span><br><span class="line">   * 获取字符串ID</span><br><span class="line">   * @return</span><br><span class="line">   */</span><br><span class="line">  private int getTextStringId() &#123;</span><br><span class="line">    try &#123;</span><br><span class="line">      // &quot;com.mazaiting.spinone.R$string&quot; -- spinone module下的R.string.text</span><br><span class="line">      Class clazz = mClassLoader.loadClass(&quot;com.mazaiting.spinone.R$string&quot;);</span><br><span class="line">      Field field = clazz.getField(&quot;text&quot;);</span><br><span class="line">      int resId = (int) field.get(null);</span><br><span class="line">      return resId;</span><br><span class="line">    &#125; catch (Exception e) &#123;</span><br><span class="line">      e.printStackTrace();</span><br><span class="line">    &#125;</span><br><span class="line">    return 0;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p>activity_main.xml</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br></pre></td><td class="code"><pre><span class="line">&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;</span><br><span class="line">&lt;android.support.constraint.ConstraintLayout</span><br><span class="line">    xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;</span><br><span class="line">    xmlns:tools=&quot;http://schemas.android.com/tools&quot;</span><br><span class="line">    android:layout_width=&quot;match_parent&quot;</span><br><span class="line">    android:layout_height=&quot;match_parent&quot;</span><br><span class="line">    tools:context=&quot;com.mazaiting.skinchange.MainActivity&quot;&gt;</span><br><span class="line"></span><br><span class="line">  &lt;LinearLayout</span><br><span class="line">      android:layout_width=&quot;match_parent&quot;</span><br><span class="line">      android:layout_height=&quot;wrap_content&quot;&gt;</span><br><span class="line">    &lt;Button</span><br><span class="line">        android:onClick=&quot;changeThemeOne&quot;</span><br><span class="line">        android:text=&quot;主题1&quot;</span><br><span class="line">        android:layout_width=&quot;wrap_content&quot;</span><br><span class="line">        android:layout_height=&quot;wrap_content&quot;/&gt;</span><br><span class="line">    &lt;Button</span><br><span class="line">        android:onClick=&quot;changeThemeTwo&quot;</span><br><span class="line">        android:text=&quot;主题2&quot;</span><br><span class="line">        android:layout_width=&quot;wrap_content&quot;</span><br><span class="line">        android:layout_height=&quot;wrap_content&quot;/&gt;</span><br><span class="line">  &lt;/LinearLayout&gt;</span><br><span class="line"></span><br><span class="line">  &lt;LinearLayout</span><br><span class="line">      android:paddingTop=&quot;50dp&quot;</span><br><span class="line">      android:layout_width=&quot;match_parent&quot;</span><br><span class="line">      android:layout_height=&quot;wrap_content&quot;</span><br><span class="line">      android:orientation=&quot;vertical&quot;&gt;</span><br><span class="line">    &lt;TextView</span><br><span class="line">        android:id=&quot;@+id/tv_show&quot;</span><br><span class="line">        android:text=&quot;@string/text&quot;</span><br><span class="line">        android:layout_width=&quot;match_parent&quot;</span><br><span class="line">        android:layout_height=&quot;wrap_content&quot;/&gt;</span><br><span class="line">    &lt;ImageView</span><br><span class="line">        android:id=&quot;@+id/iv_show&quot;</span><br><span class="line">        android:background=&quot;@color/img&quot;</span><br><span class="line">        android:layout_width=&quot;200dp&quot;</span><br><span class="line">        android:layout_height=&quot;200dp&quot;/&gt;</span><br><span class="line">  &lt;/LinearLayout&gt;</span><br><span class="line"></span><br><span class="line">&lt;/android.support.constraint.ConstraintLayout&gt;</span><br></pre></td></tr></table></figure>
</li>
<li><p>资源文件<br><img src="https://upload-images.jianshu.io/upload_images/3110861-bd368b341d5eb0aa.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="图2.png"></p>
</li>
</ul>
<p>######4). 插件Module<br>spinone和spintwo中同样使用一个类，包的全路径名与MainActivity中setContent方法中的<code>Class clazz = mClassLoader.loadClass(&quot;com.mazaiting.UiUtil&quot;);</code>中<code>com.mazaiting.UiUtil</code>相同。并在插件Module中使用相同的资源文件名进行替换。<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line">package com.mazaiting;</span><br><span class="line">/**</span><br><span class="line"> * Created by mazaiting on 2018/6/27.</span><br><span class="line"> */</span><br><span class="line"></span><br><span class="line">public class UiUtil &#123;</span><br><span class="line">  /**</span><br><span class="line">   * 获取字符串</span><br><span class="line">   */</span><br><span class="line">  public static String getTextString(Context ctx) &#123;</span><br><span class="line">    return ctx.getResources().getString(R.string.text);</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  /**</span><br><span class="line">   * 获取图片</span><br><span class="line">   */</span><br><span class="line">  public static Drawable getImageDrawable(Context ctx) &#123;</span><br><span class="line">    return ctx.getResources().getDrawable(R.color.img);</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  public static int getTextStringId()&#123;</span><br><span class="line">    return R.string.text;</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  public static int getImageDrawableId()&#123;</span><br><span class="line">    return R.color.img;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>######5). 运行<br>安装app Module 至手机，spinone和spintwo Module打包为apk文件，使用命令安装至手机，此处必须将spinone-release.apk文件push到<code>/data/data/&lt;包名&gt;/cache/</code>目录下<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">adb push C:\Users\mazaiting\Desktop\release\s</span><br><span class="line">pinone-release.apk /data/data/com.mazaiting.skinchange/cache</span><br></pre></td></tr></table></figure></p>
<p>示例效果：<br><img src="https://upload-images.jianshu.io/upload_images/3110861-fbec6c3348f7779b.gif?imageMogr2/auto-orient/strip" alt="图4.gif"></p>
<p>######6). 残留的问题</p>
<ul>
<li>每个插件包都包含一个UiUtil文件，造成代码冗余（主题2的加载）</li>
<li>主工程无法获取插件包的应用包名，从而实现动态加载。（主题1的加载）（能想到的解决办法：插件的文件名即包名）</li>
</ul>
<p>######<a href="https://gitee.com/mazaiting/app_protection/tree/master/SkinChange" target="_blank" rel="noopener">代码下载</a></p>

      
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